Mysterious Hoodie Girl

Katherine and Dylan were once best friends. Until one day they had something terrible happened between them causing their friendship to turn into hatred.
Katherine Wollace is a Youtuber. She likes to sing and inspire others. She gets bullied on the daily basis by Dylan Taylor everyone thinks he's oh so bad.
Dylan Taylor is a total cocky jerk. Everyone likes him except Katherine of course. The other students call him the 'Bad Boy'.
Dylan has no idea what happened to Katherine she disappeared. Katherine never left she just stays hidden behind a hoodie. She's bullied everyday but is use to it. What will happen when Dylan finds out when that the 'Hoodie Girl' that he has been bullying for two years now is he's ex best friend?